Robert Sayer's rare one sheet reduction of Adam's distance map of England and Wales, with views of England's principal sea ports.

The map is derived from, and a reduction of, John Adam's seminal distance map of 1677, one of the earliest economic maps. A key to the lower left of the plan provides information on: post roads marked with dotted lines, principal cross roads solid line; the names of cities are contained within a double ruled box together with their distance from London, county towns in a single line box together with distance from London, and market town are denoted by an oval. To either side of the map are eight views of the principal ports of England, from left: London, Bristol, Hull, Newcastle; right, Liverpool, Yarmouth, Portsmouth, and Plymouth.

Rare Copac records only two institutional exmaples: The British Library; and the University of Cambridge Library. OCLC records a further dissected example at Harvard but without the views of the ports.